System of reception and reproduction of radio programs



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SYSTEM OF RECEPTION AND REPRODUCTION OF RADIO PROGRAMS 3 Sheets-Sheet 2 Filed sept. 1s, 192:'

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K. PARKER Dec. 3l, 1929.

SYSTEM OF RECEPTION AND REPRODUCTION 0F RADIO\PROGRAMS.

Filed Sept. 13. 192'/ 3 Sheets-sheet a Patented Dec. 31, 1929 UNITED STATES 'PATENT OFFICE KARR PARKER, or BUFFALO, NEW YORK SYSTEM or RnoErrroN AND REPRODUCTION or RADIo PROGRAMS Appiication med september 13, 192'?.V serial No. 219,242.

Thisinv'ention relates to a sy stem of reception and distribution of radio or telephom:

cally received programs and to certain of the instrumentalities employed therein.

5 This invention is more particularly applil,cable to thedistribution of entertainment features or programs to the various rooms of a hotel, and its principal object is a system, economical tofinstall and maintain, by which "'110 ythe occupant 'of any room is enabled to "diversify the features to which he listens by l -ffselecting at ywill and Whenever desired either of at least two programs or entertainments which are being simultaneously distributed.

' '15 The programs or entertainments which are offered for selection are primarily those f. which originate in radio broadcasting studios, but may'include one or more programs otli'erwise originating such as a public address in 320 the h'otel inv which the distributionof entertainment features is being made. Y

, e Withthe foregoing objects in view the invention consists generally in at least two incoming channels of communication to each "'25 roomfto be served, the number of such rooms being as many as desired, a sound reproducen 'for each of such rooms having connected therewith a' selector switch mechanism opera#` e Y @ble at the will ofthe occupant and'by which 30 ,the reproducer may be coupled to either channel of communicatiom'radio receivers, one

for each channel of communication, and preferably a public address system having a line f f I; of communication which may be connected at `will to any one of the aforesaid channels ofcommunication. Thus,'the .occupantv'of a-f room may'l select any of the programs which 7" come into his'room to diversify his entertain- .1

140 ment, and may. also, in the case of an important 'speech or "other important program "originating within the building, Vselect the sarli'eginsteadfota"V radio program if he sodesires, and -such' diversity of entertainment .nections f 'f Figure 4 1s a perspective view of the somno.

and complication of a radio receiver local to 'each room as has heretofore been proposed.

A further object is to provide a central station or control room for the accommodation andcentralization of all operating equipment 50 such as receiving and amplifying apparatus, switchboards and other accessories whereby all such equipment may be placed under the immediate supervisionof a skilled operator who can maintain the system in operation and '55 select the various programs which are to be offered to the occupants.

yThe invention also consists in various other features of Vconstruction and arrangement which will be pointed out as the description 60 proceeds.

The number of programs to be oi'ered is limited by economic and s ace considerations only, but in order to simplify the illustration of the invention, a system having a range of 55 two simultaneous programs is shown, in which: -'f e Figurel is a schematic diagram of the control room equipment and incoming lcircuit connections. 4 Y -l 70 Figure 2 is a schematic diagram of head set and loud speaker communication channels connecting thevarious rooms to the control mmhv f.: Y Figure 3 is a schematic' diagram of the "75 guestroom, selector switch and circuit con- ,Figure 5 is a perspective vie-w of the somno drawer (partly broken), showing the selector S0 switchbox and head set.

Figure l(iis a perspective view of aloud speaker coordinated to the present system;

, The specific equipment utilized in the con- .trol room is of any suitable type and hence S5 L lno detailed explanation thereof will be given.

TheV outside or radio programs are received ampliiied and rectified by radio receiving sets l @land 2'and the'resulting sound currents con- 45 is afforded -while' avoiding the vast expense" switches 5 and 6 on the switchboard 7, said switches providing the means by which the radio sets may be connected to their respective distributing circuits 8 and 9. The insideA or microphone programs are obtained by microphones 10, suitably placed in the various public rooms of the building and connected through conductors 11, control room panel 12, conductors 13, amplifier 14, and conductors 15 to a double-pole double-throw switch 16 or its equivalent. The provision of switch 16 permits theconnection of the microphone circuit to either of the distributing circuts 8 or 9 whenever an inside program is offered in place of an outside p rogram, the unused radio receiving set being cut out by the switch 5 or 6. Thus when two radio programs are desired the switches 5 and 6 are closed and the'switch 16 opened. If, however, the program of radio receiving set 1 and a microphone program are desired, the switches 5 and 16 are closed and the switch 6 opened,'the switch 16 being closed so-as to connect the microphone circuit to the distribution circuitf9; Preferably, some ofthe rooms a're equip ed with sound. reproducers of the loud spea er type instead ofthe usual head set type. Inasmuch as 'head sets require a smaller intensity of current'for-their operation than is required by theloud speakers, the distribution circuits are divided jor branched into head set circuits 17, 18 and' loud speaker circuits '19,'20 and the intensity of the head set'current decreased by adjustable step-down transformers or other suitable means 21 and 22. These head 'set and loud speaker circuits are connected to head set and loud speaker panels 23 and 24 respectivelyto complete the wiring of the system up `-tothe communication channels `leading from the control room.

The head set circuits 17 and 18 are connected through 'the panel 23 to the respective communication channels 25 and 26 and the loud s eaker circuits 19 and 20 are connected t rough the rpanel 24 to the communication channels 27 and 28. These two sets of channels functionas main feeders, connecting the control room circuits with a number of branch circuits 29 and 30 respectively, on each floor, the connection being made through junction boxes 31 containing a switch for each communication channel. Each branch circuit 29- and v30 is connected to a separate group of rooms, each room being provided witha double circuit receptacle 32 of any suitable type for Ysuch ,cm-.inc ction.-l The head sets are'connected tobranch circuits 29 and the loud speakers to branch circuits 30 through a double circuit cord and plug 32a, a selector switch 33'and acord 34.A As used with the head set the selector switch 33 is mounted'in a closed switchlbox 35 and is operated'by a handle 33a project-ing beyond the boX. The box 35 is mounted in the drawer 36 of a table or somno 37, and in a position such that ample space is provided for the storage of the head set and cord 34 when not in use. In order to provide a clearance for the cord 34 and thus permit the drawer to be closed when the head set is being used, the front upper edge of the drawer is cut away, as at 38.

The loud speakers may be of any suitable type, a speaker of thel drum type as shown in Figure 6 being preferred. As used with the loud speaker the selector switch is of the construction previously described, its parts being suitably built into the casing of the speaker and being controlled by a handle 33b which is preferablyfitted at the upper side of the speaker.'

In the operation of the system, assuming that sound modulated current `is being received from Itwo different sources, the control room operator regulates the intensity of current in 'the `distribution circuits 8 and 9 in'ny well known manner, the intensity being regulated to a point -where, satisfactory operation of the loud speakers is obtained. The desired intensity of current 'for the head sets is `obtained by suitably adjusting the tapes of; the step-down transformers 2 1 and 22 and it will thus be seen that the head set currents and loud speaker'currents maybe severally regulated to the intensity desired. With the communication channels thus properly energized, the occupant of anyroom may select the program he desires by operating the selector switch handle 33u or 33b as the case maybe to one'position wherein the switch connects the lreproducing unit to circuit 8 or to the otherl position wherein the switch connects thereproducingunit to circuit 9. In this manner the occupant of al room is provided with a range of programs and with the means of selecting any of the programs offered. v While the above method of regulating the current intensityris preferred, it is readily apparent that other means of regulation-may be usedfwitlhout departing from the scope of this invention. For instance, the current may b e amplified -for head set use and step-up transformers employed t increase the intensity of the loud speaker current. f

l Obviously, if desired, more than one microphone progranrmay be substituted for the radio programs by being connected to therespective channels Sand' 9 and thus a selection ofthe two local programs may be made, the wiring connections for these purposes being sufficiently obvious from the foregoing 'to requlre no illustration.

Having fully described my invention, I claim: i

1. A system for the reception and reproduction of sound modulated currents comprising a central station, at least two radio receiving sets in said station, an auxiliary station. a sound reproducing unit in said auxiliary station, at least two circuit channels extending between the central and auxiliary stations, the circuits of which are adapted for connection to the respective receiving sets, additional sound modulated current sources adapted for connection in said central station to either of said circuit channels, and a selective switch in'said auxiliary station for connecting the reproducing unit to either of said circuit channels.

2. A system for the reception and reproduction of sound modulated currents comprising a central station anda series of auxiliary stations, sound reproducing units of the head set type in certain of said auxiliary stations, sound reproducing units of the loud speaker type in the remaining auxiliary stations, at least two radio receivers in the central station, main circuit channels extending from said receivers, each main-circuit channel having a branch leading to the auxiliary stations equipped with reproducing units of the head set type and another branch leading to the auxiliary stations equipped with reproducing units of the loud speaker type, regulating means for creating a difference vof current intensity .between and vappropriate to said head set and loud speaker branches, and a selective switch at each auxiliary station for connecting the reproducingV unit thereof to either of said circuit channels.

3. A system for the reception and reproduction of sound modulated currents comprising a central station and a series of auxiliary stations, sound reproducing units of the head set type in certain of said auxiliary stations, sound reproducing units of the loud speaker type in the remaining auxiliary stations at least two radio receivers in the central station, at least two mainv circuit Vchannels the circuits of which are adapted for connection to the respective receiving sets, additional sound modulated current sources Aadapted for connection in said central station to either of said circuit channels, each circuit channel having a branch leading to the auxiliary stations equipped with reproducing units of the head set type and another branch leading to the auxiliary stations equipped with repro-v ducing units of the loud speaker type, regulating means for creating a difference of current intensity between and appropriate to said head set and loud speaker branches and a selective switch at each auxiliary switch for connecting the` reproducing unit thereof to either of said circuit channels.

4.. A system for the reception and reproduction of sound modulated currents comprising a central station and a series of auxiliary stations, sound reproducing units of the head set type in certain of said auxiliary stations, sound reproducing units of the loud speaker type in the remaining auxiliary stations, at least two radio receivers in the central station, :main circuit channels extending from said receivers, each main circuit channelhaving a branch leading to the auxiliary stations equipped with reproducing units of the head set type and another branch lead-v signature.

KARR PARKER. 

